The four-star renju phenomenon happened on the 29th a few years later.
165438+1October 29th According to astronomical experts, on the evening of the 29th, Saturn, the moon, Venus and Jupiter will gather in the sky and line up in a straight line at a low altitude in the southwest, performing the astronomical wonders of "four-star alignment".
The moon, called lunar in ancient times, is the only natural satellite of the earth. As the three major planets in the solar system, Saturn has the reputation of "Lord of the Rings"; Venus is called "Taibai" in China. When it appears in the morning, people call it the "morning star". When it appears at dusk, people call it "Chang Geng Xing". Jupiter is called a "giant planet".
Shi Zhicheng, a member of the Chinese Astronomical Society and director of the Tianjin Astronomical Society, said that Saturn, Venus and Jupiter were all bright in this astronomical phenomenon. In terms of brightness, Venus is the brightest (-3.9, etc.). ), followed by Jupiter (-1.9, etc. ) and Saturn (0.6, etc. ); From the azimuth, Jupiter is at the lower right of Venus and Saturn is at the upper left of the moon. These four bright celestial bodies are embedded in the blue sky like gems, competing to shine and become a beautiful landscape on the horizon.
"Because their horizons will drop to about 10 degrees after sunset for 30 minutes, the interested public should find a place with a wide field of vision in advance and watch it with naked eyes or binoculars, while avoiding the pollution of urban light sources. Friends who like celestial photography may wish to choose the characteristic scenery as the background to photograph this rare celestial phenomenon." Shi Zhicheng warned.
How many years did four-star conjunctions occur from 300 BC1year to 3000 AD? What happened during these 6000 years? Scientists tell us that there are 49 kinds of "six-star arrangement", 3 kinds of "seven-star arrangement" and no or no "eight-star arrangement" with an angle below 5 degrees. If the θ angle is expanded to 10 degree, there are 709 "six-star renju", 52 "seven-star renju" and 3 "eight-star renju". If "nine planets alignment" occurs, the θ angle must be expanded to 15 degrees. Even so, the "nine-star renju" only appeared once in 6000 years, that is, the "nine-star renju" occurred in February14910, with an angle of 65438. Planets converge in a certain range in the night sky.
We might as well look for a slightly special "planetary conjunction", that is, a "planetary conjunction" that occurs when planets outside the earth are in a "conjunction" or "opposition" position. The so-called "combination" means that planets outside the earth are arranged in the order of planets, sun and earth; The so-called "rush" means that planets outside the earth are arranged in the order of planets, earth and sun. When the maximum angle of θ is below 30 degrees, five planetary conjunctions will occur when the six planets from Mars to Pluto are in conjunct position, but they will not occur in 6000 years when these six planets are in opposite position.
When the planet is in the "off" position, it is impossible to observe the planet outside the earth. However, if the planets on the outer side of the earth are in the position of "collision" and planetary convergence occurs, then it is an interesting astronomical phenomenon that these planets gather in a specific range in the night sky. Unfortunately, this astronomical phenomenon will not happen in the near future. The celestial phenomenon of "five-star renju" will appear at the position of "Chong" of the exoplanet, which appeared on 28531October 28th 13. At this time, the maximum θ angle is 17.2 degrees. Of course, if the angle of θ is enlarged, the rare "planetary conjunction" will appear frequently. There are two planets inside the earth-Mercury and Venus. Only three planets, including the earth, have a planetary phase, and the planetary phase is roughly in a straight line.
The planets on the inner side of the earth, some have planetary conjunction at the inner position, and some have planetary conjunction at the outer position. The so-called "antithesis" means that the sun, the planets inside the earth and the earth are arranged in order; The so-called "outer combination" means that the inner planet, the sun and the earth are arranged in order. The "planetary rendezvous" of the planets inside the earth is approximately a straight line. In the case of "involution", it occurred on1906165438+1October 30th, with an angle of 0.02 degrees. In the case of "involution", it will occur on 165438+23961October 29th with an angle of 0.02 degrees.
The interesting phenomenon of planets inside the earth is through the surface of the sun. When "conjunctions" occur, planets can be observed through the surface of the sun. This astronomical phenomenon is that the sun, the planets inside the earth and the earth are in a straight line in three-dimensional space. If a planetary conjunction occurs when Mercury and Venus meet the Earth, the projection of Mercury and Venus will appear on the surface of the sun. The apparent radius of the sun is about 0.27 degrees, and the projection of Mercury and Venus on the surface of the sun is observed when 1906 "coincides". However, at this time, because "Julian" is staggered in three-dimensional space, it is a pity that we can't see these two planets passing through the sun at the same time. According to calculations, the phenomenon that Mercury and Venus pass through the sun at the same time has never happened and will not happen in 3000 years. By the way, Mercury crossed the surface of the sun on May 7, 2003, and Venus crossed the surface of the sun on June 8, 2004.
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